class MyRunnable implements Runnable {
    @Override
    public void run() {
        while(true){
            System.out.println("hello thread !");
            try{
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
public class ThreadDemo2 {
    public static void main(String[] args) {
        Thread t = new Thread(new MyRunnable());
        t.start();

        while(true){
            System.out.println("hello main !");
            try{
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
